Interface pointers?

What I'm trying to accomplish:
1. I have a listener app that waits for a request from a client.
2. Client connects and request data whenever that listener app gets it.

Generally, I have written programs where the client app pull information from an COM/DCOM object. I have not written anything where the client makes the initial connection and its up to the DCOM object to push info to the client as it receives it.
Someone told me that the client would have to pass an interface pointer to the DCOM object so it would know how to get to the client. Is this true? If so, how do I proceed. If there is a better way, let me know.